After reading the following bmc community posts,
Unreleased commands information
and reviewing community posted blcli xml configuration information, it is concluded that these are the steps to fixing the issue.
When your jython script script receives this error --> com.bladelogic.cli.factory.CommandNotFoundException: R: Cannot find command : NSHScript, getNSHParams
follow these steps:
1. cd to the BladeLogic root's xml/cli directory
2. look for the method getNSHParams in the files located in the directory noted in step 1
3. if you see this setting (see in bold)
4. you can address the "Cannot find command:" error by adding the following line to the bljython script's java execution.